# Dcc Cua

> Project-owned DCC-CUA routing skill for bounded application UI automation. Use this skill whenever the user says dcc-cua, DCC CUA, our dcc-cua, or 我们的 dcc-cua, including browser and other non-DCC UI tasks. These phrases are a hard route to the dcc-mcp project UI Control stack and take precedence over generic Codex/OpenAI Computer Use, the computer-use Skill, @oai/sky, and Browser/Chrome plugins. If DCC-CUA is unavailable, repair or report the project route; never silently fall back to a generic computer-use provider.

- Skill: `dcc-mcp/dcc-cua` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add dcc-mcp/dcc-cua`
- Raw SKILL.md: https://api.skillmd.com/api/skills/dcc-mcp/dcc-cua/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- License: MIT-0
- Author: dcc-mcp (https://skillmd.com/u/dcc-mcp)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/dcc-mcp/dcc-cua

---


# DCC-CUA — Project UI Control Router

Use this Skill as the canonical route whenever the user explicitly names
`dcc-cua`, `DCC CUA`, `our dcc-cua`, or `我们的 dcc-cua`.

## Non-substitution contract

An explicit DCC-CUA request is a hard routing boundary, regardless of whether
the target is Maya, Chrome, a browser, or another desktop application.

- Use the project-owned `dcc-cua` runtime and DCC-MCP `ui-control` surface.
- Never load or call generic Codex/OpenAI Computer Use, the `computer-use`
  Skill, `@oai/sky`, or Browser/Chrome automation plugins for that request.
- Never treat a DCC-CUA runtime, binding, readiness, or permission failure as
  permission to change providers.
- Repair the project route when safely possible. Otherwise report the exact
  blocker and stop.
- Use a generic provider only after the user explicitly retracts the DCC-CUA
  requirement or explicitly requests that provider by name.

This boundary is provider selection, not an authorization bypass. DCC-CUA task
grants, target binding, interruption, and confirmation policy still apply.

## Route attestation

Before the first application observation or input, report all four fields:

```text
provider=dcc-cua runtime=<version> pid=<exact-pid> hwnd=<exact-native-hwnd>
```

Do not perform the operation if the provider is different or the target is not
exactly bound.

## Runtime preflight

Use the official component contract; do not download an arbitrary executable:

```bash
dcc-mcp-cli components status dcc-cua
dcc-mcp-cli components ensure dcc-cua --yes
dcc-cua manifest
dcc-cua ping
```

Run `components ensure` only when installation or repair is authorized. It
consumes the official versionless manifest, verifies the declared SHA-256, and
reconciles the independently released companion executable.

For semantic application profiles:

```bash
dcc-cua profiles
dcc-cua profile --id <profile-id>
```

Do not invent a profile ID. Runtime-advertised capabilities are authoritative.

## Execution order

1. Prefer a typed DCC-MCP host tool when it directly expresses the operation.
2. Use DCC-CUA only for the UI behavior that typed host tools cannot expose.
3. Bind one exact target with process ID and native window handle whenever the
   surface supports them.
4. Open one scoped session with the minimum task grant required for the work.
5. Take a fresh observation before each action that depends on UI state.
6. Act using stable semantic control or DOM references when available.
7. Wait for a typed state transition and verify the real final state.
8. Stop the session on success, failure, interruption, or abandonment.

An `input sent` acknowledgement is not completion evidence.

For native application menu bars, prefer the negotiated `native_menu_path`
route through `ui_control__act(action="invoke_menu", menu_path=[...])` when a
semantic menu click or Alt mnemonic cannot prove that a popup opened. A menu
invocation invalidates the current observation; honor `verification_required`
and verify the popup or resulting application state with a fresh snapshot.

## DCC-host route

For a registered DCC instance, use the DCC-MCP UI Control tools or their CLI
projection:

```bash
dcc-mcp-cli load-skill ui-control --instance-id <instance-id> --output toon
dcc-mcp-cli ui-control snapshot --instance-id <instance-id> --json '{"session_id":"ui","process_id":1234,"window_handle":5678}'
dcc-mcp-cli ui-control act --instance-id <instance-id> --json '{"session_id":"ui","control_id":"ok","action":"click","snapshot_id":"<snapshot-id>"}'
dcc-mcp-cli ui-control act --instance-id <instance-id> --json '{"session_id":"ui","action":"invoke_menu","menu_path":["Window","Arrange","Left"]}'
dcc-mcp-cli ui-control stop --instance-id <instance-id> --json '{"session_id":"ui"}'
```

Use the same exact instance and session throughout the action chain. Do not
switch to another DCC process because it looks similar.

## Browser and non-DCC route

Browser work remains inside DCC-CUA. Use the Host's typed browser surface and
`browser_dom` capabilities, not an in-app Browser or Chrome plugin.

- Bind the exact browser PID and window handle first.
- Bind the exact tab/target returned by DCC-CUA; do not infer it from a title
  alone when an exact target identifier exists.
- Keep connection-scoped sessions and capabilities on one Host connection.
- Use DOM/semantic references from the latest observation rather than stale
  coordinates.
- `browser_prepare` and existing-profile attachment require both the Host grant
  and the session task grant advertised by the runtime contract.
- Authentication challenges, CAPTCHAs, purchases, account/security changes,
  and unexpected permission prompts remain trusted human boundaries.

## Target and evidence invariants

- Preserve PID and native window handle in observations and audit records.
- Treat a changed PID, window handle, tab target, or session owner as a fresh
  binding that requires a fresh observation.
- Keep `full` readiness strict. If only an exact-window or typed-browser route
  is independently ready, report that route-specific degraded readiness.
- Honor Escape/user interruption immediately and do not resume without fresh
  authorization and observation.
- Do not expose local usernames, internal package paths, browser profile data,
  credentials, tokens, or unrelated window titles in public evidence.
- Verify success by reading the destination state after the mutation.

## Failure behavior

When DCC-CUA cannot complete the request, report:

1. the exact component/runtime version,
2. the exact target identity that was bound,
3. the failing readiness, capability, permission, or action stage,
4. the last safe observation or typed error, and
5. the safe next repair step.

Do not mention a generic Computer Use fallback unless the user asks for one.